Correct AnswerC. Operating only one converter
Quick Explanation
A non-circulating-current dual converter prevents the two converter bridges from conducting simultaneously. Only one converter is enabled at a time; an interlocking/dead-time scheme blocks the other, so there is no closed path for circulating current.
Detailed Explanation
Concept & Reasoning
Dual converters provide reversible DC voltage/current using two controlled rectifier bridges. In circulating-current mode both bridges may operate simultaneously and a reactor limits the current caused by instantaneous voltage differences. In non-circulating mode, simultaneous conduction is deliberately prevented; the bridges are alternately enabled.
How to Solve It in the Exam
Reactor → circulating-current mode; one bridge at a time → non-circulating mode.
Important Exam PointLook for interlocking/dead time in practical implementations.
Related Revision Path
This question sits in the revision path Power Electronics → Converters → Dual Converters .
